#!/usr/bin/python
# Author: Zion Orent <zorent@ics.com>
# Copyright (c) 2015 Intel Corporation.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

from __future__ import print_function
import time, sys, signal, atexit
from upm import pyupm_mhz16 as upmMhz16

def main():
    # Instantiate a MHZ16 serial CO2 sensor on uart 0.
    # This example was tested on the Grove CO2 sensor module.
    myCO2 = upmMhz16.MHZ16(0)

    ## Exit handlers ##
    # This stops python from printing a stacktrace when you hit control-C
    def SIGINTHandler(signum, frame):
        raise SystemExit

    # This function lets you run code on exit,
    # including functions from myCO2
    def exitHandler():
        print("Exiting")
        sys.exit(0)

    # Register exit handlers
    atexit.register(exitHandler)
    signal.signal(signal.SIGINT, SIGINTHandler)

    # make sure port is initialized properly.  9600 baud is the default.
    if (not myCO2.setupTty(upmMhz16.cvar.int_B9600)):
        print("Failed to setup tty port parameters")
        sys.exit(0)

    print ("Make sure that the sensor has had "
    "at least 3 minutes to warm up\n"
    "or you will not get valid results.\n"
    "The temperature reported is not the ambient temperature,\n"
    "but rather the temperature of the sensor elements.")

    time.sleep(1)

    while(1):
        if (not myCO2.getData()):
            print("Failed to retrieve data")
        else:
            outputStr = ("CO2 concentration: {0} PPM, "
            "Temperature (in C): {1}".format(
            myCO2.getGas(), myCO2.getTemperature()))
            print(outputStr)

        time.sleep(2)

if __name__ == '__main__':
    main()
